We divide 790821 by 21
We're looking to find how many times 21 goes into 790821.

On to step 1:
When dividing 7 by 21, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 21

Step 2:
79 divided by 21 is 3 with a remainder of 16.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 63 from 79, we get 16.
Include the next digit (0) from the dividend after 16, then repeat: 160 / 21

Step 3:
If we divide 160 by 21, we get 7 and a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 37.0
Deduct 147 from 160 and we're left with 13.
Take the next digit (8) from the dividend and append it to 13, then repeat: 138 / 21

Going ahead to step 4:
If we divide 138 by 21, we get 6 and a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 376.0
Subtract 126 from 138 to get 12.
Take the next digit (2) from the dividend and append it to 12, then repeat: 122 / 21

Step 5:
122 divided by 21 is 5 with a remainder of 17.
The next digit of our result is 5. 
Result so far: 3765.0
If we subtract 105 from 122, we get 17.
Bring next digit (1) of the dividend behind the 17 and repeat the process: 171 / 21

Step 6:
When dividing 171 by 21, we get 8 with a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 37658.0
Deduct 168 from 171 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 37658.1
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 8:
90 divided by 21 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 37658.14
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 37658.142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 10:
If we divide 180 by 21, we get 8 and a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 37658.1428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 11:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 37658.14285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 12:
21 goes into 150 7 times with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 37658.142857
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 13:
If we divide 30 by 21, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 37658.1428571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 14:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 37658.14285714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The quotient of the division is 37658.14285714, and the remainder is 6e-09.